The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeP.F. Collier & son, 1902 - 356ÆäÀÌÁö |
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41 ÆäÀÌÁö
... allied species , we generally perceive in each do- mestic race , as already remarked , less uniformity of char- acter than in true species . Domestic races often have a somewhat monstrous character ; by which I mean , that , although ...
... allied species , we generally perceive in each do- mestic race , as already remarked , less uniformity of char- acter than in true species . Domestic races often have a somewhat monstrous character ; by which I mean , that , although ...
42 ÆäÀÌÁö
... allied . With these exceptions ( and with that of the perfect fertility of varieties when crossed - a subject hereafter to be discussed ) , domestic races of the same species differ from each other in the same manner as do the closely ...
... allied . With these exceptions ( and with that of the perfect fertility of varieties when crossed - a subject hereafter to be discussed ) , domestic races of the same species differ from each other in the same manner as do the closely ...
43 ÆäÀÌÁö
... allied natural species - for instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog has been ...
... allied natural species - for instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog has been ...
48 ÆäÀÌÁö
... allied to the carrier , but , instead of a long beak , has a very short and broad one . The pouter has a much elongated body , wings and legs ; and its enormously developed crop , which it glories in inflating , may well excite ...
... allied to the carrier , but , instead of a long beak , has a very short and broad one . The pouter has a much elongated body , wings and legs ; and its enormously developed crop , which it glories in inflating , may well excite ...
57 ÆäÀÌÁö
... allied species . Some effect may be attributed to the direct and definite action of the external conditions . of life , and some to habit ; but he would be a bold man who would account by such agencies for the differences between a dray ...
... allied species . Some effect may be attributed to the direct and definite action of the external conditions . of life , and some to habit ; but he would be a bold man who would account by such agencies for the differences between a dray ...
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adapted admit affinities allied species America analogous ancient animals appear beak become bees believe belonging birds breeds cause cells characters climate closely allied color common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamell©¡ larv©¡ less living male mammals manner marsupial migration modification modified descendants natural selection naturalists nearly nest offspring organs ORIGIN OF SPECIES paleozoic parent peculiar perfect pigeon pistil plants pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder theory tion trees variability variations varieties vary whole wings young